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a031fe8d1d
linux/rust/Makefile
Linus Torvalds a031fe8d1d Rust changes for v6.6 
In terms of lines, most changes this time are on the pinned-init API
 and infrastructure. While we have a Rust version upgrade, and thus a
 bunch of changes from the vendored 'alloc' crate as usual, this time
 those do not account for many lines.
 
 Toolchain and infrastructure:
 
  - Upgrade to Rust 1.71.1. This is the second such upgrade, which is a
    smaller jump compared to the last time.
 
    This version allows us to remove the '__rust_*' allocator functions
    -- the compiler now generates them as expected, thus now our
    'KernelAllocator' is used.
 
    It also introduces the 'offset_of!' macro in the standard library
    (as an unstable feature) which we will need soon. So far, we were
    using a declarative macro as a prerequisite in some not-yet-landed
    patch series, which did not support sub-fields (i.e. nested structs):
 
        #[repr(C)]
        struct S {
            a: u16,
            b: (u8, u8),
        }
 
        assert_eq!(offset_of!(S, b.1), 3);
 
  - Upgrade to bindgen 0.65.1. This is the first time we upgrade its
    version.
 
    Given it is a fairly big jump, it comes with a fair number of
    improvements/changes that affect us, such as a fix needed to support
    LLVM 16 as well as proper support for '__noreturn' C functions, which
    are now mapped to return the '!' type in Rust:
 
        void __noreturn f(void); // C
        pub fn f() -> !;         // Rust
 
  - 'scripts/rust_is_available.sh' improvements and fixes.
 
    This series takes care of all the issues known so far and adds a few
    new checks to cover for even more cases, plus adds some more help
    texts. All this together will hopefully make problematic setups
    easier to identify and to be solved by users building the kernel.
 
    In addition, it adds a test suite which covers all branches of the
    shell script, as well as tests for the issues found so far.
 
  - Support rust-analyzer for out-of-tree modules too.
 
  - Give 'cfg's to rust-analyzer for the 'core' and 'alloc' crates.
 
  - Drop 'scripts/is_rust_module.sh' since it is not needed anymore.
 
 Macros crate:
 
  - New 'paste!' proc macro.
 
    This macro is a more flexible version of 'concat_idents!': it allows
    the resulting identifier to be used to declare new items and it
    allows to transform the identifiers before concatenating them, e.g.
 
        let x_1 = 42;
        paste!(let [<x _2>] = [<x _1>];);
        assert!(x_1 == x_2);
 
    The macro is then used for several of the pinned-init API changes in
    this pull.
 
 Pinned-init API:
 
  - Make '#[pin_data]' compatible with conditional compilation of fields,
    allowing to write code like:
 
        #[pin_data]
        pub struct Foo {
            #[cfg(CONFIG_BAR)]
            a: Bar,
            #[cfg(not(CONFIG_BAR))]
            a: Baz,
        }
 
  - New '#[derive(Zeroable)]' proc macro for the 'Zeroable' trait, which
    allows 'unsafe' implementations for structs where every field
    implements the 'Zeroable' trait, e.g.:
 
        #[derive(Zeroable)]
        pub struct DriverData {
            id: i64,
            buf_ptr: *mut u8,
            len: usize,
        }
 
  - Add '..Zeroable::zeroed()' syntax to the 'pin_init!'  macro for
    zeroing all other fields, e.g.:
 
        pin_init!(Buf {
            buf: [1; 64],
            ..Zeroable::zeroed()
        });
 
  - New '{,pin_}init_array_from_fn()' functions to create array
    initializers given a generator function, e.g.:
 
        let b: Box<[usize; 1_000]> = Box::init::<Error>(
            init_array_from_fn(|i| i)
        ).unwrap();
 
        assert_eq!(b.len(), 1_000);
        assert_eq!(b[123], 123);
 
  - New '{,pin_}chain' methods for '{,Pin}Init<T, E>' that allow to
    execute a closure on the value directly after initialization, e.g.:
 
        let foo = init!(Foo {
            buf <- init::zeroed()
        }).chain(|foo| {
            foo.setup();
            Ok(())
        });
 
  - Support arbitrary paths in init macros, instead of just identifiers
    and generic types.
 
  - Implement the 'Zeroable' trait for the 'UnsafeCell<T>' and
    'Opaque<T>' types.
 
  - Make initializer values inaccessible after initialization.
 
  - Make guards in the init macros hygienic.
 
 'allocator' module:
 
  - Use 'krealloc_aligned()' in 'KernelAllocator::alloc' preventing
    misaligned allocations when the Rust 1.71.1 upgrade is applied later
    in this pull.
 
    The equivalent fix for the previous compiler version (where
    'KernelAllocator' is not yet used) was merged into 6.5 already,
    which added the 'krealloc_aligned()' function used here.
 
  - Implement 'KernelAllocator::{realloc, alloc_zeroed}' for performance,
    using 'krealloc_aligned()' too, which forwards the call to the C API.
 
 'types' module:
 
  - Make 'Opaque' be '!Unpin', removing the need to add a 'PhantomPinned'
    field to Rust structs that contain C structs which must not be moved.
 
  - Make 'Opaque' use 'UnsafeCell' as the outer type, rather than inner.
 
 Documentation:
 
  - Suggest obtaining the source code of the Rust's 'core' library using
    the tarball instead of the repository.
 
 MAINTAINERS:
 
  - Andreas and Alice, from Samsung and Google respectively, are joining
    as reviewers of the "RUST" entry.
 
 As well as a few other minor changes and cleanups.
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Merge tag 'rust-6.6' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
 "In terms of lines, most changes this time are on the pinned-init API
  and infrastructure. While we have a Rust version upgrade, and thus a
  bunch of changes from the vendored 'alloc' crate as usual, this time
  those do not account for many lines.

  Toolchain and infrastructure:

   - Upgrade to Rust 1.71.1. This is the second such upgrade, which is a
     smaller jump compared to the last time.

     This version allows us to remove the '__rust_*' allocator functions
     -- the compiler now generates them as expected, thus now our
     'KernelAllocator' is used.

     It also introduces the 'offset_of!' macro in the standard library
     (as an unstable feature) which we will need soon. So far, we were
     using a declarative macro as a prerequisite in some not-yet-landed
     patch series, which did not support sub-fields (i.e. nested
     structs):

         #[repr(C)]
         struct S {
             a: u16,
             b: (u8, u8),
         }

         assert_eq!(offset_of!(S, b.1), 3);

   - Upgrade to bindgen 0.65.1. This is the first time we upgrade its
     version.

     Given it is a fairly big jump, it comes with a fair number of
     improvements/changes that affect us, such as a fix needed to
     support LLVM 16 as well as proper support for '__noreturn' C
     functions, which are now mapped to return the '!' type in Rust:

         void __noreturn f(void); // C
         pub fn f() -> !;         // Rust

   - 'scripts/rust_is_available.sh' improvements and fixes.

     This series takes care of all the issues known so far and adds a
     few new checks to cover for even more cases, plus adds some more
     help texts. All this together will hopefully make problematic
     setups easier to identify and to be solved by users building the
     kernel.

     In addition, it adds a test suite which covers all branches of the
     shell script, as well as tests for the issues found so far.

   - Support rust-analyzer for out-of-tree modules too.

   - Give 'cfg's to rust-analyzer for the 'core' and 'alloc' crates.

   - Drop 'scripts/is_rust_module.sh' since it is not needed anymore.

  Macros crate:

   - New 'paste!' proc macro.

     This macro is a more flexible version of 'concat_idents!': it
     allows the resulting identifier to be used to declare new items and
     it allows to transform the identifiers before concatenating them,
     e.g.

         let x_1 = 42;
         paste!(let [<x _2>] = [<x _1>];);
         assert!(x_1 == x_2);

     The macro is then used for several of the pinned-init API changes
     in this pull.

  Pinned-init API:

   - Make '#[pin_data]' compatible with conditional compilation of
     fields, allowing to write code like:

         #[pin_data]
         pub struct Foo {
             #[cfg(CONFIG_BAR)]
             a: Bar,
             #[cfg(not(CONFIG_BAR))]
             a: Baz,
         }

   - New '#[derive(Zeroable)]' proc macro for the 'Zeroable' trait,
     which allows 'unsafe' implementations for structs where every field
     implements the 'Zeroable' trait, e.g.:

         #[derive(Zeroable)]
         pub struct DriverData {
             id: i64,
             buf_ptr: *mut u8,
             len: usize,
         }

   - Add '..Zeroable::zeroed()' syntax to the 'pin_init!' macro for
     zeroing all other fields, e.g.:

         pin_init!(Buf {
             buf: [1; 64],
             ..Zeroable::zeroed()
         });

   - New '{,pin_}init_array_from_fn()' functions to create array
     initializers given a generator function, e.g.:

         let b: Box<[usize; 1_000]> = Box::init::<Error>(
             init_array_from_fn(|i| i)
         ).unwrap();

         assert_eq!(b.len(), 1_000);
         assert_eq!(b[123], 123);

   - New '{,pin_}chain' methods for '{,Pin}Init<T, E>' that allow to
     execute a closure on the value directly after initialization, e.g.:

         let foo = init!(Foo {
             buf <- init::zeroed()
         }).chain(|foo| {
             foo.setup();
             Ok(())
         });

   - Support arbitrary paths in init macros, instead of just identifiers
     and generic types.

   - Implement the 'Zeroable' trait for the 'UnsafeCell<T>' and
     'Opaque<T>' types.

   - Make initializer values inaccessible after initialization.

   - Make guards in the init macros hygienic.

  'allocator' module:

   - Use 'krealloc_aligned()' in 'KernelAllocator::alloc' preventing
     misaligned allocations when the Rust 1.71.1 upgrade is applied
     later in this pull.

     The equivalent fix for the previous compiler version (where
     'KernelAllocator' is not yet used) was merged into 6.5 already,
     which added the 'krealloc_aligned()' function used here.

   - Implement 'KernelAllocator::{realloc, alloc_zeroed}' for
     performance, using 'krealloc_aligned()' too, which forwards the
     call to the C API.

  'types' module:

   - Make 'Opaque' be '!Unpin', removing the need to add a
     'PhantomPinned' field to Rust structs that contain C structs which
     must not be moved.

   - Make 'Opaque' use 'UnsafeCell' as the outer type, rather than
     inner.

  Documentation:

   - Suggest obtaining the source code of the Rust's 'core' library
     using the tarball instead of the repository.

  MAINTAINERS:

   - Andreas and Alice, from Samsung and Google respectively, are
     joining as reviewers of the "RUST" entry.

  As well as a few other minor changes and cleanups"

* tag 'rust-6.6' of https://github.com/Rust-for-Linux/linux: (42 commits)
  rust: init: update expanded macro explanation
  rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`
  rust: init: make `PinInit<T, E>` a supertrait of `Init<T, E>`
  rust: init: implement `Zeroable` for `UnsafeCell<T>` and `Opaque<T>`
  rust: init: add support for arbitrary paths in init macros
  rust: init: add functions to create array initializers
  rust: init: add `..Zeroable::zeroed()` syntax for zeroing all missing fields
  rust: init: make initializer values inaccessible after initializing
  rust: init: wrap type checking struct initializers in a closure
  rust: init: make guards in the init macros hygienic
  rust: add derive macro for `Zeroable`
  rust: init: make `#[pin_data]` compatible with conditional compilation of fields
  rust: init: consolidate init macros
  docs: rust: clarify what 'rustup override' does
  docs: rust: update instructions for obtaining 'core' source
  docs: rust: add command line to rust-analyzer section
  scripts: generate_rust_analyzer: provide `cfg`s for `core` and `alloc`
  rust: bindgen: upgrade to 0.65.1
  rust: enable `no_mangle_with_rust_abi` Clippy lint
  rust: upgrade to Rust 1.71.1
  ...
2023-08-29 08:19:46 -07:00

462 lines
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Makefile
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# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_RUST) += core.o compiler_builtins.o
always-$(CONFIG_RUST) += exports_core_generated.h
# Missing prototypes are expected in the helpers since these are exported
# for Rust only, thus there is no header nor prototypes.
obj-$(CONFIG_RUST) += helpers.o
CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations
always-$(CONFIG_RUST) += libmacros.so
no-clean-files += libmacros.so
always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
exports_kernel_generated.h
always-$(CONFIG_RUST) += uapi/uapi_generated.rs
obj-$(CONFIG_RUST) += uapi.o
ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
obj-$(CONFIG_RUST) += build_error.o
else
always-$(CONFIG_RUST) += build_error.o
endif
obj-$(CONFIG_RUST) += exports.o
always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
# Avoids running `$(RUSTC)` for the sysroot when it may not be available.
ifdef CONFIG_RUST
# `$(rust_flags)` is passed in case the user added `--sysroot`.
rustc_sysroot := $(shell $(RUSTC) $(rust_flags) --print sysroot)
rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
ifeq ($(quiet),silent_)
cargo_quiet=-q
rust_test_quiet=-q
rustdoc_test_quiet=--test-args -q
rustdoc_test_kernel_quiet=>/dev/null
else ifeq ($(quiet),quiet_)
rust_test_quiet=-q
rustdoc_test_quiet=--test-args -q
rustdoc_test_kernel_quiet=>/dev/null
else
cargo_quiet=--verbose
endif
core-cfgs = \
--cfg no_fp_fmt_parse
alloc-cfgs = \
--cfg no_borrow \
--cfg no_fmt \
--cfg no_global_oom_handling \
--cfg no_macros \
--cfg no_rc \
--cfg no_str \
--cfg no_string \
--cfg no_sync \
--cfg no_thin
quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
cmd_rustdoc = \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
$(rustc_target_flags) -L$(objtree)/$(obj) \
--output $(objtree)/$(obj)/doc \
--crate-name $(subst rustdoc-,,$@) \
@$(objtree)/include/generated/rustc_cfg $<
# The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
# can be used to specify a custom logo. However:
# - The given value is used as-is, thus it cannot be relative or a local file
# (unlike the non-custom case) since the generated docs have subfolders.
# - It requires adding it to every crate.
# - It requires changing `core` which comes from the sysroot.
#
# Using `-Zcrate-attr` would solve the last two points, but not the first.
# The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
# command-like flags to solve the issue. Meanwhile, we use the non-custom case
# and then retouch the generated files.
rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
rustdoc-alloc rustdoc-kernel
$(Q)cp $(srctree)/Documentation/images/logo.svg $(objtree)/$(obj)/doc
$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(objtree)/$(obj)/doc
$(Q)find $(objtree)/$(obj)/doc -name '*.html' -type f -print0 | xargs -0 sed -Ei \
-e 's:rust-logo\.svg:logo.svg:g' \
-e 's:rust-logo\.png:logo.svg:g' \
-e 's:favicon\.svg:logo.svg:g' \
-e 's:<link rel="alternate icon" type="image/png" href="[./]*favicon-(16x16|32x32)\.png">::g'
$(Q)echo '.logo-container > img { object-fit: contain; }' \
>> $(objtree)/$(obj)/doc/rustdoc.css
rustdoc-macros: private rustdoc_host = yes
rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
--extern proc_macro
rustdoc-macros: $(src)/macros/lib.rs FORCE
$(call if_changed,rustdoc)
rustdoc-core: private rustc_target_flags = $(core-cfgs)
rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
$(call if_changed,rustdoc)
rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
$(call if_changed,rustdoc)
# We need to allow `rustdoc::broken_intra_doc_links` because some
# `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
# functions. Ideally `rustdoc` would have a way to distinguish broken links
# due to things that are "configured out" vs. entirely non-existing ones.
rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
-Arustdoc::broken_intra_doc_links
rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
$(call if_changed,rustdoc)
rustdoc-kernel: private rustc_target_flags = --extern alloc \
--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
--extern bindings --extern uapi
rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
$(obj)/bindings.o FORCE
$(call if_changed,rustdoc)
quiet_cmd_rustc_test_library = RUSTC TL $<
cmd_rustc_test_library = \
OBJTREE=$(abspath $(objtree)) \
$(RUSTC) $(rust_common_flags) \
@$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
--crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
--out-dir $(objtree)/$(obj)/test --cfg testlib \
--sysroot $(objtree)/$(obj)/test/sysroot \
-L$(objtree)/$(obj)/test \
--crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
$(call if_changed,rustc_test_library)
rusttestlib-macros: private rustc_target_flags = --extern proc_macro
rusttestlib-macros: private rustc_test_library_proc = yes
rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
$(call if_changed,rustc_test_library)
rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE
$(call if_changed,rustc_test_library)
rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE
$(call if_changed,rustc_test_library)
quiet_cmd_rustdoc_test = RUSTDOC T $<
cmd_rustdoc_test = \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) --test $(rust_common_flags) \
@$(objtree)/include/generated/rustc_cfg \
$(rustc_target_flags) $(rustdoc_test_target_flags) \
--sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
-L$(objtree)/$(obj)/test --output $(objtree)/$(obj)/doc \
--crate-name $(subst rusttest-,,$@) $<
quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
cmd_rustdoc_test_kernel = \
rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) --test $(rust_flags) \
@$(objtree)/include/generated/rustc_cfg \
-L$(objtree)/$(obj) --extern alloc --extern kernel \
--extern build_error --extern macros \
--extern bindings --extern uapi \
--no-run --crate-name kernel -Zunstable-options \
--test-builder $(objtree)/scripts/rustdoc_test_builder \
$< $(rustdoc_test_kernel_quiet); \
$(objtree)/scripts/rustdoc_test_gen
%/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
$(src)/kernel/lib.rs $(obj)/kernel.o \
$(objtree)/scripts/rustdoc_test_builder \
$(objtree)/scripts/rustdoc_test_gen FORCE
$(call if_changed,rustdoc_test_kernel)
# We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
# so for the moment we skip `-Cpanic=abort`.
quiet_cmd_rustc_test = RUSTC T $<
cmd_rustc_test = \
OBJTREE=$(abspath $(objtree)) \
$(RUSTC) --test $(rust_common_flags) \
@$(objtree)/include/generated/rustc_cfg \
$(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
--sysroot $(objtree)/$(obj)/test/sysroot \
-L$(objtree)/$(obj)/test \
--crate-name $(subst rusttest-,,$@) $<; \
$(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
$(rustc_test_run_flags)
rusttest: rusttest-macros rusttest-kernel
# This prepares a custom sysroot with our custom `alloc` instead of
# the standard one.
#
# This requires several hacks:
# - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,
# including third-party crates that need to be downloaded, plus custom
# `build.rs` steps. Thus hardcoding things here is not maintainable.
# - `cargo` knows how to build the standard library, but it is an unstable
# feature so far (`-Zbuild-std`).
# - `cargo` only considers the use case of building the standard library
# to use it in a given package. Thus we need to create a dummy package
# and pick the generated libraries from there.
# - Since we only keep a subset of upstream `alloc` in-tree, we need
# to recreate it on the fly by putting our sources on top.
# - The usual ways of modifying the dependency graph in `cargo` do not seem
# to apply for the `-Zbuild-std` steps, thus we have to mislead it
# by modifying the sources in the sysroot.
# - To avoid messing with the user's Rust installation, we create a clone
# of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`
# steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.
#
# In the future, we hope to avoid the whole ordeal by either:
# - Making the `test` crate not depend on `std` (either improving upstream
# or having our own custom crate).
# - Making the tests run in kernel space (requires the previous point).
# - Making `std` and friends be more like a "normal" crate, so that
# `-Zbuild-std` and related hacks are not needed.
quiet_cmd_rustsysroot = RUSTSYSROOT
cmd_rustsysroot = \
rm -rf $(objtree)/$(obj)/test; \
mkdir -p $(objtree)/$(obj)/test; \
cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \
cp -r $(srctree)/$(src)/alloc/* \
$(objtree)/$(obj)/test/sysroot/lib/rustlib/src/rust/library/alloc/src; \
echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \
echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \
>> $(objtree)/$(obj)/test/rustc_sysroot; \
chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \
$(CARGO) -q new $(objtree)/$(obj)/test/dummy; \
RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \
test -Zbuild-std --target $(rustc_host_target) \
--manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \
rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \
cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \
$(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib
rusttest-prepare: FORCE
$(call if_changed,rustsysroot)
rusttest-macros: private rustc_target_flags = --extern proc_macro
rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
$(call if_changed,rustc_test)
$(call if_changed,rustdoc_test)
rusttest-kernel: private rustc_target_flags = --extern alloc \
--extern build_error --extern macros --extern bindings --extern uapi
rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
rusttestlib-uapi FORCE
$(call if_changed,rustc_test)
$(call if_changed,rustc_test_library)
ifdef CONFIG_CC_IS_CLANG
bindgen_c_flags = $(c_flags)
else
# bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
# plugin backend and/or the Clang driver would be perfectly compatible with GCC.
#
# For the moment, here we are tweaking the flags on the fly. This is a hack,
# and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
# if we end up using one of those structs).
bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
-mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
-mindirect-branch=thunk-extern -mindirect-branch-register \
-mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
-mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
-mno-pointers-to-nested-functions -mno-string \
-mno-strict-align -mstrict-align \
-fconserve-stack -falign-jumps=% -falign-loops=% \
-femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
-fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
-fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
-fzero-call-used-regs=% -fno-stack-clash-protection \
-fno-inline-functions-called-once -fsanitize=bounds-strict \
--param=% --param asan-%
# Derived from `scripts/Makefile.clang`.
BINDGEN_TARGET_x86 := x86_64-linux-gnu
BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
# All warnings are inhibited since GCC builds are very experimental,
# many GCC warnings are not supported by Clang, they may only appear in
# some configurations, with new GCC versions, etc.
bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
# Auto variable zero-initialization requires an additional special option with
# clang that is going to be removed sometime in the future (likely in
# clang-18), so make sure to pass this option only if clang supports it
# (libclang major version < 16).
#
# https://github.com/llvm/llvm-project/issues/44842
# https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
ifdef CONFIG_INIT_STACK_ALL_ZERO
libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
endif
endif
bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
$(bindgen_extra_c_flags)
endif
ifdef CONFIG_LTO
bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
else
bindgen_c_flags_lto = $(bindgen_c_flags)
endif
bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__
quiet_cmd_bindgen = BINDGEN $@
cmd_bindgen = \
$(BINDGEN) $< $(bindgen_target_flags) \
--use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
--no-debug '.*' \
-o $@ -- $(bindgen_c_flags_final) -DMODULE \
$(bindgen_target_cflags) $(bindgen_target_extra)
$(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
$(shell grep -v '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
$(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
$(src)/bindgen_parameters FORCE
$(call if_changed_dep,bindgen)
$(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
$(shell grep -v '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
$(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
$(src)/bindgen_parameters FORCE
$(call if_changed_dep,bindgen)
# See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
# with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
# given it is `libclang`; but for consistency, future Clang changes and/or
# a potential future GCC backend for `bindgen`, we disable it too.
$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
--blocklist-type '.*' --allowlist-var '' \
--allowlist-function 'rust_helper_.*'
$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
-I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@
$(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
$(call if_changed_dep,bindgen)
quiet_cmd_exports = EXPORTS $@
cmd_exports = \
$(NM) -p --defined-only $< \
| grep -E ' (T|R|D) ' | cut -d ' ' -f 3 \
| xargs -Isymbol \
echo 'EXPORT_SYMBOL_RUST_GPL(symbol);' > $@
$(obj)/exports_core_generated.h: $(obj)/core.o FORCE
$(call if_changed,exports)
$(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
$(call if_changed,exports)
$(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
$(call if_changed,exports)
$(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
$(call if_changed,exports)
quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
cmd_rustc_procmacro = \
$(RUSTC_OR_CLIPPY) $(rust_common_flags) \
--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
--crate-type proc-macro \
--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
# Procedural macros can only be used with the `rustc` that compiled it.
# Therefore, to get `libmacros.so` automatically recompiled when the compiler
# version changes, we add `core.o` as a dependency (even if it is not needed).
$(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE
$(call if_changed_dep,rustc_procmacro)
quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
cmd_rustc_library = \
OBJTREE=$(abspath $(objtree)) \
$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
--emit=dep-info=$(depfile) --emit=obj=$@ \
--emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
--crate-type rlib -L$(objtree)/$(obj) \
--crate-name $(patsubst %.o,%,$(notdir $@)) $< \
$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
rust-analyzer:
$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
$(abs_srctree) $(abs_objtree) \
$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
redirect-intrinsics = \
__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
__muloti4 __multi3 \
__udivmodti4 __udivti3 __umodti3
ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
# These intrinsics are defined for ARM64 and RISCV64
redirect-intrinsics += \
__ashrti3 \
__ashlti3 __lshrti3
endif
$(obj)/core.o: private skip_clippy = 1
$(obj)/core.o: private skip_flags = -Dunreachable_pub
$(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
$(obj)/core.o: private rustc_target_flags = $(core-cfgs)
$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
$(call if_changed_dep,rustc_library)
$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
$(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
$(call if_changed_dep,rustc_library)
$(obj)/alloc.o: private skip_clippy = 1
$(obj)/alloc.o: private skip_flags = -Dunreachable_pub
$(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
$(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE
$(call if_changed_dep,rustc_library)
$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
$(call if_changed_dep,rustc_library)
$(obj)/bindings.o: $(src)/bindings/lib.rs \
$(obj)/compiler_builtins.o \
$(obj)/bindings/bindings_generated.rs \
$(obj)/bindings/bindings_helpers_generated.rs FORCE
$(call if_changed_dep,rustc_library)
$(obj)/uapi.o: $(src)/uapi/lib.rs \
$(obj)/compiler_builtins.o \
$(obj)/uapi/uapi_generated.rs FORCE
$(call if_changed_dep,rustc_library)
$(obj)/kernel.o: private rustc_target_flags = --extern alloc \
--extern build_error --extern macros --extern bindings --extern uapi
$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
$(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
$(call if_changed_dep,rustc_library)
endif # CONFIG_RUST
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